TW201317587A - Dimension measuring device and method thereof - Google Patents

Abstract

A dimension measuring device includes a storage unit for storing standard images of a target object. The dimension measuring device further includes a process unit for obtaining a variety of captured images captured from predetermined views, and identifying difference between each captured image and the corresponding standard image. If each captured image and the corresponding standard image have no differences, the dimension of the target object is determined be qualified, otherwise, dimension of the target object is determined to be unqualified.

Description

Size detecting device and method

The invention relates to a detecting device and a method, in particular to a size detecting device and a method for automatically detecting the size of an object to be tested.

When the production line is automated to produce the motherboard, it is necessary to accurately check the size (including length, width and height) of various electronic components on the motherboard to ensure the quality of the assembly. In the past, the size of these electronic components was generally detected by vernier calipers. This process relied heavily on manpower and had some errors.

With the development of technology, some optical inspection tools such as length measuring instruments or optical micrometers have emerged, which can greatly improve the accuracy of detection. Nowadays, many inspection tools have been developed into the use of precision machinery, light, electricity and other principles, and combined with electronic computer technology, such as coordinate detection machine and gear measuring instrument, can achieve the size of the object to be tested automatically Detection. However, it is still necessary to provide a new size detecting device and method that can provide users with more choices.

In view of the above, it is necessary to provide a size detecting device and method that can solve the above problems.

The present invention provides a size detecting device, comprising: a storage unit for storing a standard image of an object to be tested; a processing unit for acquiring a captured image of the object to be tested at different angles and the standard image, respectively calculating and comparing the images The absolute value of the IAED difference value of each primitive block in the captured image and the corresponding primitive block in the corresponding standard image on the RGB three channels, and the average difference between the captured images and the corresponding standard image on the RGB three channels IAED The absolute value and the generated threshold coefficient, thereby determining whether there is a difference between the captured image and the corresponding standard image, wherein IAED represents the average energy density of the image, and the processing unit determines that the captured image does not differ from the corresponding standard image. When it is determined that the size of the object to be tested is qualified, when the processing unit determines that there is a difference between the at least one captured image and the corresponding standard image, it is determined that the size of the object to be tested is unqualified.

The present invention also provides a size detecting method, comprising: acquiring a captured image of a different angle of an object to be tested and the standard image; respectively calculating and comparing each primitive block in the captured image and a corresponding primitive block in the corresponding standard image. The absolute value of the IAED difference value on the RGB three-channel, the absolute value of the average difference between the captured image and the corresponding standard image on the RGB three-channel IAED, and the generated threshold coefficient, where IAED represents the average energy density of the image; Calculating and comparing the results to determine whether there is a difference between the captured images and the corresponding standard images. When there is no difference between the captured images and the corresponding standard images, it is determined that the size of the object to be tested is qualified; when at least one of the captured images is If there is a difference in the corresponding standard image, it is judged that the size of the object to be tested is unqualified.

The invention obtains the photographed image of the object to be tested and compares it with the standard image, thereby judging whether the size is qualified or not, and the detection precision is high.

1 is a hardware structure diagram of a size detecting device 1 of the present invention. In the embodiment, the size detecting device 1 is configured to acquire a captured image a of different angles of the object 2 to be tested (for example, a fan holder on the motherboard), and corresponding to the object 2 to be tested. The standard image b is compared. When the size detecting device 1 determines that there is no difference between the captured image a and the corresponding standard image b, it is determined that the size of the object to be tested 2 is qualified; when the size detecting device 1 determines at least one of the captured image a and the corresponding standard When there is a difference in the image b, it is judged that the size of the object to be tested 2 is unqualified.

The captured images a of the object to be tested 2 can be acquired by an image pickup device 3 connected to the size detecting device 1. The image capture device 3 can be a camera, digital camera or other optical imaging device. In the embodiment, the lens of the image capturing device 3 is located at a certain distance directly above the object to be tested 2 to obtain the captured image a including the length and width dimension information of the object 2 to be tested; and the center of the object 2 to be tested respectively The specific distance is moved in four directions of up, down, left, and right, and the captured image a including the height size information of the object to be tested 2 is obtained from four different angles of up, down, left, and right. For example, after the object 2 to be tested is moved from the center to the left with respect to the image capturing device 3, the image capturing device 3 can take the captured image a including the height information of the object to be tested 2 from the right; the object 2 to be tested is relative to the image. When the ingesting device 3 is moved from the center to the right, the image capturing device 3 can take the captured image a including the height information of the object 2 to be tested from the left.

The size detecting device 1 includes a storage unit 11 and a processing unit 12. A standard image b of the object 2 to be tested is stored in the storage unit 11. In the embodiment, the standard image b is a sample image obtained by imaging a sample satisfying a predetermined size from a specific angle, and the specific angle is consistent with the angle of acquiring the captured image a of the object 2 to be tested.

The processing unit 12 is configured to acquire the captured images a and compare the captured images a with the corresponding standard images b in the storage unit 11 . When the processing unit 12 recognizes that there is a difference between the at least one captured image a and the corresponding standard image b, it determines that the size of the object to be tested 2 is unqualified; when the processing unit 12 recognizes that the captured image a and the corresponding standard image b are not When there is a difference, it is judged that the size of the object to be tested 2 is qualified. In the present embodiment, the size detecting device 1 further includes a display unit 13 for displaying the determination result on the display unit 13.

In the present embodiment, the process of the processing unit 12 identifying whether there is a difference between the captured image a and the standard image b can be combined with the prior application of the patent inventor's prior application, "Difference Image Automatic Identification Device and Method" (Patent Application No. 201010561045.8) ). According to the prior patent application file, the processing unit 12 calculates and compares the absolute value of the IAED difference value on each of the RGB three channels of each primitive block in the captured image a and the corresponding primitive block in the standard image b. The absolute value of the average difference between the image a and the standard image b on the RGB three-channel IAED and the generated threshold coefficient determine whether there is a difference between each primitive block of the captured image a and the corresponding primitive block in the standard image b, wherein IAED represents the average energy density of the image. If there is no difference between each primitive block of the captured image a and the corresponding primitive block in the standard image b, the size of the object to be tested 2 is qualified. If there is a difference between each primitive block of the captured image a and the corresponding primitive block in the standard image b, the size of the object to be tested 2 is unqualified.

In the present embodiment, in order to overcome the fact that the lens of the image capturing device 3 cannot be accurately positioned at a specific position relative to the object to be tested 2, or the micro-vibration of the platform supporting the object to be tested 2, etc., the captured image a is generated. The error requires high-precision positioning of the object to be tested 2 before the comparison between the captured image a and the standard image b. In the present embodiment, the size detecting device 1 further includes an image positioning unit 14 according to the prior application of the inventor of the patent application, "image positioning device and method for the object to be photographed" (patent application number 20310252601.8) The object to be tested 2 is positioned as described in . Specifically, the image positioning unit 14 acquires the captured image a and the standard image b, and calculates the coordinates according to the corner coordinates of the corners of the object 2 to be tested in the captured image a and the standard coordinates of the corners in the standard image b. The image positioning coordinates of each primitive point of the image a are captured, and each of the primitives is remapped according to the image positioning coordinates of each primitive point to generate the captured image a after the object to be tested 2 is positioned. It can be understood that the device 2 to be tested can also be positioned by other means when needed, such as a laser positioning device commonly used on a production line.

2 is a flow chart of a size detecting method of the present invention.

(Step 201): The processing unit 12 acquires the captured image a and the standard image b of the object 2 to be tested at different angles.

(Step 202): The processing unit 12 separately calculates and compares the absolute values of the IAED difference values of the primitive blocks in the captured image a and the corresponding primitive blocks in the corresponding standard image b on the RGB three channels, and the shooting The absolute value of the average difference between the image a and the corresponding standard image b on the RGB three-channel IAED and the resulting threshold coefficient, where IAED represents the average energy density of the image.

(Step 203): The processing unit 12 determines whether there is no difference between the captured image a and the corresponding standard image b according to the calculation and the comparison result. If not, proceed to step 204; otherwise, proceed to step 205.

(Step 204): The processing unit 12 determines that the size detection of the object 2 to be tested is unsatisfactory.

(Step 205): The processing unit 12 determines that the size of the object to be tested 2 is qualified.

It is to be understood by those skilled in the art that the above embodiments are only intended to illustrate the invention, and are not intended to limit the invention, as long as it is within the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.

1. . . Size detecting device

2. . . Object to be tested

3. . . Image capture device

11. . . Storage unit

12. . . Processing unit

13. . . Display unit

14. . . Image positioning unit

1 is a hardware structural diagram of a size detecting device in a preferred embodiment of the present invention.

2 is a flow chart of a method for detecting a size in a preferred embodiment of the present invention.

Claims (9)

A size detecting device comprising:
a storage unit for storing a standard image of the object to be tested;
a processing unit, configured to acquire a captured image of the object to be tested at different angles and the standard image, respectively calculate and compare each primitive block in the captured image and the corresponding primitive block in the corresponding standard image on the RGB three-channel The absolute value of the IAED difference value, the absolute value of the average difference between the captured image and the corresponding standard image on the RGB three-channel IAED, and the generated threshold coefficient, thereby determining whether the captured image and the corresponding standard image are different, Wherein the IAED indicates the average energy density of the image. When the processing unit determines that there is no difference between the captured image and the corresponding standard image, it determines that the size of the object to be tested is qualified; when the processing unit determines at least one captured image and the corresponding standard When there is a difference in the image, it is judged that the size of the object to be tested is unqualified. The size detecting device of claim 1, wherein the photographed image of the object to be tested at different angles includes a photographed image including the length and width dimension information of the object to be tested taken directly above the object to be tested, and The captured image including the height dimension information of the object to be tested is moved from the center of the object to be tested in the four directions of up, down, left, and right, respectively. The size detecting device of claim 1, wherein the image of the object to be tested at different angles is subjected to a positioning process before the comparison, wherein the positioning process is based on the corner of the object to be tested in the captured image. The sub-attract coordinates and the standard coordinates of the corners in the standard image calculate the image positioning coordinates of each of the primitive points of the captured image, and re-map each primitive according to the image positioning coordinates of each primitive point. The captured image of the object to be tested is positioned. The size detecting device according to claim 1, wherein the photographed image of the object to be tested at different angles is a photographed image taken after the object to be tested is positioned by a laser positioning device. The size detecting device of claim 1, wherein the size detecting device further comprises a display unit, wherein the processing unit is further configured to display the determination result on the display unit. A method of dimension detection, comprising:
Obtaining a captured image of the object to be tested at different angles and the standard image;
Calculating and comparing the absolute value of the IAED difference value of each primitive block in the captured image and the corresponding primitive block in the corresponding standard image on the RGB three channels, the captured image and the corresponding standard image in the RGB three channel The absolute value of the average difference of the upper IAED and the resulting threshold coefficient, where IAED represents the average energy density of the image;
Determining whether there is a difference between the captured images and the corresponding standard images according to the above calculation and comparison result, and when there is no difference between the captured images and the corresponding standard images, determining that the size of the object to be tested is qualified; when at least one shot is taken When there is a difference between the image and the corresponding standard image, it is judged that the size of the object to be tested is unqualified. The size detecting method according to claim 6, wherein the photographed image of the object to be tested at different angles includes a photographed image including the length and width dimension information of the object to be tested taken directly from the object to be tested, and The captured image including the height dimension information of the object to be tested is moved from the center of the object to be tested in the four directions of up, down, left, and right, respectively. The size detecting method of claim 6, wherein the image of the object to be tested is subjected to a positioning process before the comparison, wherein the positioning process is based on the corner of the object to be tested in the captured image. The sub-attract coordinates and the standard coordinates of the corners in the standard image calculate the image positioning coordinates of each of the primitive points of the captured image, and re-map each primitive according to the image positioning coordinates of each primitive point. The captured image of the object to be tested is positioned. The size detecting method according to claim 6, wherein the photographed image of the object to be tested at different angles is a photographed image of the object to be tested after being positioned by a laser positioning device.